“We looked at it as Barry Allen,” said Johns. “When he first appeared back in the Fifties, he ushered in the Silver Age of DC superheroes. In the same way, he’s going to usher in some new and pretty insane concepts to the Arrow world, but in a very grounded way.”

“The important thing is that our characters, who people have really come to know and like, will react to the extraordinary changes to their world, hopefully in a very realistic way,” picked up Andrew Kreisberg.

“These ‘powers’ won’t be treated as commonplace, on the show. They will be extraordinary events and the world, and our characters in it, will react accordingly.”

John Wesley Shipp as Barry Allen in the shortlived 1990 Flash TV series.

Barry Allen will be introduced in Episodes 8, 9 and 20 of Arrow Season 2, and it’s unclear whether we’ll see him don that iconic red suit and temple wings over the course of the show.

“For right now, because you’re just meeting Barry Allen, CSI, we’re not really focusing on potential costumes, or that stuff,” said Kreisberg. “That’s further down the road. We’re going to do what we did when we started with Arrow, which is hopefully write a great script and look for an amazing actor to play the part.

“When we first meet Barry Allen, he’s just a forensic scientist working for the police department. He’s just an ordinary man, when we meet him. As we always do on Arrow, we try to keep things as grounded and realistic as possible. That’s how the audience will be introduced to Barry and get to know him, before his life gets a little bit faster.

“I think part of the fun for the audience is to see how we do our Arrow take on The Flash legacy. I think some of it will feel very familiar to fans of the comics, and some of it will feel hopefully different, but fresh and exciting. The same way we approached Arrow is the same way we’re approaching Barry.”